FAQs
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

ST25R Obtain RSSI of multiple tags

he2
Associate II

‎2024-10-15 12:46 AM

Hello everyone,

I am working on a project that requires identifying the RSSI of all surrounding tags.
If "tag 6361" is not placed, the remaining three tags can be recognized and their RSSI can be obtained. However, after placing "tag 6361", only "tag 6361" can be recognized, and the other three tags cannot communicate.
The RSSI of the four tags is: tag "66E9" has an RSSI of 101, tag "635A" has an RSSI of 28, tag "681D" has an RSSI of 73, and tag "675A" has an RSSI of 1736.

dea5a365034dcd0cb236aff7ca216e4.jpgMay I ask how to make these four labels recognized simultaneously?

0 Kudos
1 REPLY 1
Ulysses HERNIOSUS
ST Employee

‎2024-10-15 03:50 AM

Hello He2,

I see typically two possibilities why such effects are appearing:

  1. Your center tag causes heavy de-tuning and the tags further away don't get enough field strength anymore.
    This could be verified by placing a sniff coil - aligned to the tag - to see if it actually answers.
  2. The center strong tag response is much stronger than the one of the others and the others are responding but are not recognized as collision/additional tags. This point goes then into protocol details which are handling simultaneous responses differently. Which type of tags are you using and which function from reader side?

Best Regards, Ulysses

Top